JP4833021B2 - Waveform display device, waveform display method, and waveform display program - Google Patents

Description

  The present invention relates to a waveform display device, a waveform display method, and a waveform display program for displaying a waveform of return light of an optical transmission line obtained from OTDR.

  In an optical transmission line composed of an optical fiber, a connector, a splitter, and the like, monitoring is performed based on measurement information output from a measurement device that measures the return light of light incident on the optical transmission line called OTDR (Optical Time Domain Reflectometers). Has been done. Abnormalities detected by monitoring performed based on the measurement information include light loss due to bending of the optical fiber, reflection and loss due to optical fiber breakage, and inundation detection installed in the closure Loss is detected when the sensor is submerged. The monitoring device is configured to constantly monitor these abnormalities for 24 hours on the basis of measurement information obtained from the OTDR, and to notify an alarm when an abnormality occurs. Then, when an alarm is notified from the optical transmission line monitoring device, a monitoring response is performed such that the monitor identifies the cause of the abnormality that has occurred by referring to the waveform of the return light. Yes.

By the way, the following techniques exist as conventional techniques for displaying measured information as a waveform. For example, in the technique described in Patent Document 1, in a device for displaying a waveform such as a digital oscilloscope, a desired measurement value is selected from measurement values that have already been measured, and the waveform of the selected measurement value is displayed. It is possible. Further, in the technique described in Patent Document 2, when a plurality of channels of waveforms are displayed, the display screen is divided in the time axis direction, and the waveforms of the plurality of channels can be simultaneously displayed on the divided screens.
JP 2002-333454 A JP-A-5-321837

  In the above-described monitoring of the optical transmission line, the cause of the occurrence of an abnormality is identified by referring to the temporal change of the waveform. However, in the above prior art, it is possible to select a desired measurement value and display the waveform of the selected measurement value, or to display a plurality of waveforms at the same time, but shows a temporal change in the waveform. There is a problem that it is difficult to perform such display.

  The present invention has been made to solve the above-mentioned problems, and its purpose is to indicate the cause of the abnormality to the monitor by showing the change in the time-varying return light of the measurement information measured by the OTDR. It is an object of the present invention to provide a waveform display device, a waveform display method, and a waveform display program that can be facilitated.

In order to solve the above-described problem, the present invention is configured such that an optical pulse is incident in the longitudinal direction of an optical fiber constituting an optical transmission line, and the light intensity of return light obtained by the incident and the time when the return light is received. A waveform display device that displays measurement information measured by a measurement device that measures a distance based on the measurement information, and stores the measurement information measured by the measurement device and the measurement time corresponding to the measurement information in association with each other. Storage means and display means for sequentially reading the measurement information stored in the storage means in the order of the measurement time, and performing continuous display in which the read measurement information is continuously displayed on the screen in the order of reading as a waveform , The display means selects any one of the measurement information stored in the storage means as initial measurement information, displays the selected initial measurement information on the screen as a waveform, If the waveform of the initial setting information performs the continuous display in a state of being displayed on the screen, without erasing the waveform of the initial setting information is the waveform display device comprising that you perform the continuous display .

Further, the present invention measures the light intensity of the return light obtained by the incidence of the light pulse in the longitudinal direction of the optical fiber constituting the optical transmission line and the distance based on the time when the return light is received. A waveform display method for displaying waveform of measurement information measured by a measurement device, the measurement information measured by the measurement device and a measurement time corresponding to the measurement information are associated with each other and stored in a storage unit; When the measurement information stored in the storage means is sequentially read out in the order of the measurement time, and when the continuous display in which the read measurement information is continuously displayed on the screen in the order read out as a waveform is stored in the storage means One of the measurement information is selected as initial measurement information, the selected initial measurement information is displayed on the screen as a waveform, and the waveform of the initial setting information is displayed on the screen. When performing the continuous display in a state of being displayed, without erasing the waveform of the initial setting information, a waveform display method which comprises the steps of: performing the continuous display.

Further, the present invention measures the light intensity of the return light obtained by the incidence of the light pulse in the longitudinal direction of the optical fiber constituting the optical transmission line and the distance based on the time when the return light is received. Storing in the storage means the measurement information measured by the measurement device and the measurement time corresponding to the measurement information in association with the computer of the waveform display device that displays the waveform of the measurement information measured by the measurement device; When the measurement information stored in the storage means is sequentially read out in the order of the measurement time, and when the continuous display in which the read measurement information is continuously displayed on the screen in the order read out as a waveform is stored in the storage means One of the measurement information is selected as initial measurement information, the selected initial measurement information is displayed on the screen as a waveform, and the waveform of the initial setting information is If a state displayed on the serial screen performs the continuous display, without erasing the waveform of the initial setting information, the waveform display program for executing and performing the continuous display.

  According to this invention, the waveform display device includes the storage unit that stores the measurement information in association with the measurement time measured by the measurement device, and sequentially stores the measurement information stored in the storage unit in the order of the measurement time. The measurement information stored in the reading and storing means is sequentially read in the order of the measurement time, and the display is continuously displayed on the screen in the order in which the read measurement information is read as a waveform. Thereby, the waveform of the measurement information measured by the measuring device can be displayed as a moving image. Therefore, the user can recognize the temporal change in the waveform of the measurement information, and can easily identify the cause of the occurrence of abnormality estimated from the change.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic block diagram showing a waveform display device 1 according to the present embodiment, a measurement device 20 connected to the waveform display device, and an optical transmission line to be measured by the measurement device 20.

  The optical transmission line shown in FIG. 1 is a PON (Passive Optical Network) optical transmission line, and includes an optical fiber 60, a splitter 70, optical fibers 61-1 to 61-M, a splitter 71-1, and an optical fiber 62-1. This is a PON optical transmission line composed of ˜62-N. In addition, the termination apparatus etc. which are installed in a user's house are connected to the termination | terminus of the optical fibers 62-1 to 62-N, and transmission / reception is performed between the user's terminal connected to the termination apparatus and the transmission apparatus 40. .

  The splitters 70 and 71-1 are devices that branch or multiplex optical signals, and are also referred to as optical couplers. For example, in the splitter 70, the optical signals from the optical fiber 60 are converted into a plurality of optical fibers 61-1 to 61-61. The optical signal from the plurality of optical fibers 61-1 to 61-M is multiplexed to the optical fiber 60. The number of branches in a general splitter is 4, 8, 16, 32, and it is possible to branch more by connecting the splitters in multiple stages.

  The directional coupler (optical coupler) 30 has three connection ends that are connected to an optical fiber. Each of the connection ends is connected to a splitter 70 by an optical fiber 60 and is transmitted by an optical fiber 50-1. 170 is connected and connected to the measuring apparatus 20 by an optical fiber 50-2. The directional coupler 30 performs wavelength-dependent demultiplexing and multiplexing, and enters the communication light incident from the transmission device 40 through the optical fiber 50-1 and the measurement device 20 through the optical fiber 50-2. Are combined and output to the optical fiber 60. In addition, when a light wave is incident from the optical fiber 60, the directional coupler 30 does not output a reflected wave of communication light to the optical fiber 50-2 and is connected to the transmission device 40 without being output to the optical fiber 50-1. The output light of the optical pulse from the measurement device 20 (hereinafter referred to as reflected light) is not output to the optical fiber 50-1, but is output to the optical fiber 50-2 connected to the measurement device 20. .

  For example, the above-described OTDR or the like is applied to the measuring device 20, and a test optical pulse signal is incident on the optical fiber 50-2, and the reflected light returned by reflection from the optical transmission line is received. Here, the reflected light refers to reflections generated by connector connection points and fusion points of the optical fibers 50-2, 60, 61-1 to 61-M, 62-1 to 62-N, and the optical fiber 61-. 1 to 62-N, and reflection caused by back scattering caused by Rayleigh scattering inherent to the optical fibers 60, 61-1 to 61-M, and 62-1 to 62-N. That means. Further, the measuring device 20 measures the light intensity of the received reflected light, calculates the distance from the input end of the optical fiber 50-2 based on the received light time, and obtains the reflection obtained by the incidence of one optical pulse signal. Measurement information in which the light intensity and the distance of light are associated is generated and output in association with the measurement time. Here, as the measurement time, for example, the time when all the reflected light corresponding to the incident light pulse is received by the measuring device 20 or the time given to the file when the measurement information is generated as a file is applied. Is done.

  The waveform display device 1 includes a control device 2 and a display 3, and a CRT (Cathode Ray Tube) or a liquid crystal display screen is applied to the display 3, for example. In the control device 2, the connection unit 10 is connected to the measurement device 20, receives measurement information associated with a measurement time output from the measurement device 20, and receives the received measurement information as a measurement information DB (Data Base) 12. To record. For example, the operation unit 11 is connected to a mouse or a keyboard, and inputs operation information including predetermined instruction information obtained by detecting operations of these devices to the measurement information selection unit 13 and the display unit 14. The measurement information selection unit 13 determines the measurement information stored in the measurement information DB 12 and the measurement time associated with the measurement information according to the operation information input from the operation unit 11 that has been operated by the operator of the waveform display device 1. Information is arranged in order of measurement time, and a measurement information selection screen 210 shown in FIG. The measurement information selection unit 13 receives operation information including a selection instruction for selecting all or part of the measurement information displayed on the measurement information selection screen 210 from the operation unit 11 that has been operated by the user. The information indicating the selected measurement information is input to the waveform display unit 14a of the display unit 14.

  The display unit 14 is connected to the display 3 and includes a waveform display unit 14a, a region selection unit 14b, and a cursor selection unit 14c. In the display unit 14, the waveform display unit 14 a sequentially reads out the corresponding measurement information from the measurement information DB 12 based on the information indicating the measurement information input from the measurement information selection unit 13, and calculates the distance for each read measurement information. A waveform with the axis and the intensity of reflected light as the vertical axis is continuously displayed on the display 3. Here, the process of continuously displaying (hereinafter referred to as “continuous display”) is to read measurement information from the measurement information DB 12 of the next measurement time while displaying the measurement information of a certain measurement time on the display 3. In this case, the waveform displayed on the display 3 is erased, and the waveform of the measurement information for the next measurement time is displayed. As a result, the waveform of the measurement information is displayed as a moving image, and the time of the measurement information Changes are shown. Further, the waveform display means 14a selects the first measurement information as the initial measurement information, and displays the waveform of the selected initial measurement information in a color that can be distinguished from the continuously displayed waveform. As a result, by selecting the waveform in the normal state as the initial measurement information, the comparison based on the waveform in the normal state can be performed.

  The initial measurement information is not limited to the first measurement information stored in the measurement information DB 12, and the user arbitrarily selects the measurement information stored in the measurement information DB 12, and selects the selected measurement information as the initial measurement information. You may be able to do it.

  The area selection unit 14b selects an area to be enlarged and displayed in the waveform of all measurement information displayed on the display 3 by the waveform display unit 14a. Specifically, the area selecting unit 14b displays an area specifying frame 121 shown in FIG. 5 on the display 3 to specify the area, and displays an enlarged waveform of the area selected by the area specifying frame 121 on the waveform displaying unit 14a. 3 is displayed. The area selecting unit 14b records the coordinate information of the area selected by the area specifying frame 121 in the internal storage area, and the coordinate information stored in the internal storage area is stored by the waveform display unit 14a. The waveform is referred to when the waveform is continuously displayed, and the continuous display is also performed for the waveform obtained by enlarging the region specified by the coordinate information of the measurement information sequentially read. In addition, when the position or range of the area specifying frame 121 is changed by the user operating the mouse or the like, the area selecting unit 14b detects the coordinate information of the changed area specifying frame 121, and the detected coordinate information Is stored in the internal storage area, and the enlarged waveform of the area whose position has been changed is displayed on the display 3 on the waveform display means 14a.

  The cursor selection unit 14c displays a cursor parallel to the axis (vertical axis) indicating the light intensity on the coordinate plane including the waveform displayed enlarged by the waveform display unit 14a, the light intensity at the distance indicated by the cursor, and The value of the distance is displayed on the display 3. In addition, the cursor selection unit 14c specifies a cursor to be displayed according to operation information input from the operation unit 11 in response to an operation of the user's mouse or the like, and changes the position of the specified cursor according to the user's operation and displays the cursor. To do.

  Next, the operation of the waveform display device 1 of the present embodiment will be described with reference to FIGS. FIG. 2 is a flowchart showing an outline of the operation of the waveform display device 1, and the operation of the waveform display device 1 will be described according to the flowchart.

  First, when the operation unit 11 receives a user operation and inputs an activation instruction to the display unit 14, the display unit 14 displays the waveform display screen 100 shown in FIG. 3 on the display 3 (step S1). Next, when the user operates the mouse or the like on the waveform display screen 100 and selects the waveform comparison button 200, the operation unit 11 detects the selection of the waveform comparison button 200 and instructs the measurement information selection unit 13 to start. input. The measurement information selection unit 13 to which the start instruction is input displays a measurement information selection screen 210 shown in FIG. In the measurement information selection screen 210, information on a name given in advance for each measurement information (for example, 0120060215042235.0004) and associated measurement time (for example, 2006/02/15 4:22:00) is measured time. Are displayed in order of time.

  On the measurement information selection screen 210, when a user operates a mouse or the like, a plurality of pieces of measurement information to be displayed continuously are selected (reference numeral 202). In the selected state, a display button 201 is further displayed by a user operation. Is selected, the measurement information selection unit 13 inputs information indicating the selected plurality of measurement information to the waveform display unit 14a of the display unit 14 (step S2).

  When the information indicating a plurality of pieces of measurement information is input from the measurement information selection unit 13, the waveform display unit 14 a displays the waveform display screen 100 shown in FIG. 5 and the continuous display operation screen 215 on the display 3. The waveform display unit 14 a further displays an all measurement information display screen 120 and a measurement information display screen 110 on the waveform display screen 100. The waveform display unit 14a reads information indicating the first measurement information from the measurement information DB 12 among the information indicating the plurality of measurement information input from the measurement information selection unit 13, and sets the waveform of the read measurement information as the initial measurement information. Choose as. Then, the waveform display unit 14 a displays the waveform of the selected initial measurement information on the all measurement information display screen 120. At this time, the waveform display means 14a displays the waveform of the area specifying frame 121 to be enlarged and designated designated by the area selection means 14b as the waveform 150 in the partial measurement information display area 130 (step S3).

  In a state where the waveform of the initial measurement information is displayed in the partial measurement information display area 130, the cursor selection unit 14c displays the cursor 301 (corresponding to the cursor 1 on the measurement information display screen 110) in the partial measurement information display area 130. To do. The cursor selection unit 14c displays the distance value indicated by the displayed cursor 301 in the “cursor position” field of the measurement information display screen 110, and displays the light intensity of the measurement information at the distance in the “measurement data” field. The light intensity at the distance of the measurement information selected as the initial measurement information is displayed in the “initial data” column. The cursor selection unit 14c calculates a difference between the light intensity indicated in the “measurement data” column and the light intensity indicated in the “initial data” column, and displays the difference between the measurement information and the initial measurement information “measurement”. The calculated difference value is displayed in the “initial” column. In the example shown in FIG. 5, the waveform 151 of the measurement information to be displayed next is already displayed by the waveform display means 14a, and the difference is displayed as “−0.002 (dB)”.

  The continuous display operation screen 215 is provided with a play button 217, a pause button 218, a stop button 219, and a progress state display area 216 indicating a display progress state. The continuous display operation screen 215 is displayed on the waveform display screen 100 on the screen. The name of the measurement information and the measurement time associated with the measurement information are displayed. When the user operates the mouse or the like on the continuous display operation screen 215 to select the playback button 217, the waveform display unit 14a starts continuous display of measurement information (step S4). FIGS. 6 to 8 are diagrams showing states displayed on the display 3 after the continuous display is started. In FIG. 6, about half of the state has progressed to the progress state display area 216 by the waveform display unit 14a. The partial measurement information display area 130 displays a waveform 150 of initial measurement information and a waveform 151-1 of measurement information corresponding to the progress state. In the “Measurement-Initial” column of the measurement information display screen 110, the light intensity at the distance indicated by the cursor 301 of the waveform 151-1 and the light intensity at the distance indicated by the cursor 301 of the waveform 150 of the initial measurement information are displayed. The difference value is displayed.

  7 and 8 show a state in which the measurement time has further passed from FIG. 6, and shows a state in which the waveform of the measurement information changes from the waveform 151-2 to the waveform 151-3. By referring to the changes in the waveform 151, the waveform 151-1, the waveform 151-2, and the waveform 151-3 of the measurement information displayed in the measurement information display area 130, the cause of the occurrence of the abnormality can be specified.

  In the configuration of the above embodiment, the optical transmission line is a PON type optical transmission line. However, the present invention is not limited to the configuration of the embodiment, and may be applied to a star-type connection optical transmission line or the like. Is possible. Further, by connecting an optical switch between the measuring device 20 and the directional coupler 30, connecting a plurality of optical transmission lines to the optical switch, and switching the optical switch, each optical transmission line is connected to the measuring device 20. Measurement may be performed. In the above embodiment, the measurement device 20 and the waveform display device 1 are connected. However, the present invention is not limited to the configuration of the embodiment, and the measurement device 20 accumulates measurement information. You may make it leave. In the case of accumulating, after the measurement is completed, a plurality of pieces of measurement information are stored together in a recording medium and read out from the recording medium or the like to the waveform display device 1, or a plurality of pieces of information are transmitted through a network or the like. These measurement information may be collectively transmitted to the waveform display device 1.

  In the above embodiment, the continuous display operation screen 215 is provided with the play button 217, the pause button 218, and the stop button 219. However, a fast-forward button and a rewind button are further provided to display the waveform. It may be possible to fast forward or rewind.

  With the configuration of the above embodiment, it is possible to continuously display the waveform of the measurement information measured by the measurement device 20 in the order of measurement time. Thereby, the user can recognize the temporal change of the waveform of the measurement information continuously displayed without reading the measurement information one by one and displaying the waveform, and is inferred from the change. It is possible to reduce the time required to identify the cause of the abnormal occurrence. In optical transmission lines, failures may occur at multiple locations.In such cases, the history of each failure location is observed, and the observed history is combined to identify the cause of the failure. However, the continuous display by the waveform display device 1 shown in the present embodiment is effective in that the observation can be quickly performed in the correspondence.

  The storage means described in the present invention corresponds to the measurement information DB 12, the display means corresponds to the display unit 14, and the screen corresponds to the display 3.

  The waveform display device 1 described above has a computer system therein. The waveform display process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing this program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

It is the schematic block diagram which showed the optical transmission line used as the measuring object of the waveform display apparatus in this embodiment, the measuring apparatus connected to the said waveform display apparatus, and a measuring apparatus. It is the flowchart which showed operation | movement of the waveform display apparatus in the same embodiment. It is the figure which showed the waveform display screen (the 1) in the same embodiment. It is the figure which showed the measurement information display screen in the same embodiment. It is the figure which showed the waveform display screen (the 2) in the same embodiment. It is the figure which showed the waveform display screen (the 3) in the same embodiment. It is the figure which showed the waveform display screen (the 4) in the same embodiment. It is the figure which showed the waveform display screen (the 5) in the same embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Waveform display apparatus, 2 Control apparatus, 3 Display, 10 Connection part, 11 Operation part, 12 Measurement information DB, 13 Measurement information selection part, 14 Display part, 14a Waveform display means, 14b Area selection means, 14c Cursor selection means, 20 measuring device, 30 directional coupler, 40 transmission device, 50-1, 50-2 optical fiber, 60 optical fiber, 61-1 to 61-M optical fiber, 62-1 to 62-N optical fiber, 70, 71-1 Splitter

Claims (3)

The light pulse is incident to the longitudinal direction of the optical fibers constituting the optical transmission line, and more measures the light intensity of the resulting return light to the measurement equipment which measures the distance based on the time that has received the return light by the incident the measurement information to a waveform display equipment to waveform display,
A storage means to store in association with measurement time and corresponding to the measurement information and the measurement information measured by said measuring device,
Said sequential reads the measurement information stored in the storage means in the time order of the measurement time, the display hand stage of continuous display for displaying the measurement information read on the screen in succession to the read sequentially as waveform,
Equipped with a,
The display means includes
One of the measurement information stored in the storage means is selected as initial measurement information, the selected initial measurement information is displayed on the screen as a waveform, and the waveform of the initial setting information is displayed on the screen. When performing the continuous display in a state where the initial setting information is present, the continuous display is performed without deleting the waveform of the initial setting information
Waveform display device comprising a call. Measured by a measuring device that enters a light pulse in the longitudinal direction of the optical fiber constituting the optical transmission line and measures the light intensity of the return light obtained by the incidence and the distance based on the time when the return light was received. A waveform display method for displaying measurement information in a waveform,
Storing in the storage means the measurement information measured by the measurement device and the measurement time corresponding to the measurement information in association with each other;
Sequentially reading measurement information stored in the storage means in order of measurement time;
When performing continuous display in which the readout measurement information is continuously displayed on the screen in the order of readout as a waveform , any one of the measurement information stored in the storage unit is selected as initial measurement information, and the selected initial measurement is selected. When information is displayed on the screen as a waveform and the continuous display is performed in a state where the waveform of the initial setting information is displayed on the screen, the continuous display is performed without erasing the waveform of the initial setting information. Steps,
A waveform display method comprising: Measured by a measuring device that enters a light pulse in the longitudinal direction of the optical fiber constituting the optical transmission line and measures the light intensity of the return light obtained by the incidence and the distance based on the time when the return light was received. To the computer of the waveform display device that displays the measurement information in waveform,
Storing in the storage means the measurement information measured by the measurement device and the measurement time corresponding to the measurement information in association with each other;
Sequentially reading measurement information stored in the storage means in order of measurement time;
When performing continuous display in which the readout measurement information is continuously displayed on the screen in the order of readout as a waveform , any one of the measurement information stored in the storage unit is selected as initial measurement information, and the selected initial measurement is selected. When information is displayed on the screen as a waveform and the continuous display is performed in a state where the waveform of the initial setting information is displayed on the screen, the continuous display is performed without erasing the waveform of the initial setting information. Steps,
Waveform display program to execute

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